Swing-forging machines



Dec. 23, 1969 F. KocKs 3,4

SWING-FORGING MACHINES Filed Jan. 5, 196'? Inventor Friedrich Kocfks United States Patent 3,485,081 SWING-FORGING MACHINES- Friedrich Kocks, Dusseldorf, Germany, assignor to Kornmanditgesellschaft Friedrich Kocks, Dusseldorf, Germany, a corporation of Germany Filed Jan. 3, 1967, Ser. No. 606,652

Int. Cl. B21j 7/18 US. Cl. 72-406 2 Claims ABSTRACT OF THE DISCLOSURE An improvement is provided in swing-forging machines of the type described in Uebing et al. Patent 3,114,276

comprising placing the shafts for the rods carrying the working jaws or dies for imparting a rocking motion in a common plane generally transverse to the pass line thereby making possible a greater degree of regularity in movement and a greater degree of selectivity in the size of eccentric drive.

This invention relates to swing-forging machines and particularly improvements in swing-forging machines such as that illustrated and described in Uebing patent 3,114,276 issued Dec. 17, 1963. Swing-forging machines of the past have been limited in the amount of reduction which could be attained. This was a detriment to maximum efliciency and utilization of such machines. The present invention provides a new structural arrangement of excenter location which in turn permits a more advantageous movement of the forging die and significantly greater reductions.

The objective of the invention is to provide a mechanism enabling to produce a bar-shaped finished product by stretch forging a billet or a slab from plastic, especially metallic material.

The invention is based on the aforementioned Uebing mechanism using two pair of swing dies for stretch forging equipped with swing dies moving in pairs in opposite direction. Each swing die is provided with a working face changing over eventually towards the delivery end into a special planishing face. Each swing die is actuated through two guide rods and an additional guide by eccentric or crank gear drives which are fixed at the machine frame and driven with the same speed. Thereby, putting on, lifting oif, and rolling off the swing die are in the first line effected by the eccentric and crank gear drives driving the guide rods. The advancing and returning motions of the swing die, however, are determined by the eccentric drive connected with the additional guide rod.

Such a unit equipped with two pairs of dies moving in two planes perpendicular one to another and alternately forming the work piece has ensured good results when stretch forging bars of approximately square cross sections.

This unit equipped with one pair of dies as already suggested at another point can be used on principle for producing strip.

Trials proved that a slight degree of stretching only can be realized when the height of the work piece is reduced with the aid of one pair of dies only. In case the dies are set closer one to another or to a more inclined position enabling a larger opening angle, the feed becomes very irregular so that higher degrees of stretching can thus be obtained only to a limited degree.

The present invention overcomes these problems by "ice increasing the rolling olf movement of the swing die. This is realized according to the invention by arranging the axles of the eccentric and crank gear drives one after the other perpendicularly to the pass line. Thereby, it is not considered essential that the axles of all eccentric or crank gear drives are approximately exactly in one plane.

The suggested measure permits an operator to select without limitation the size of the eccentric or crank gear drive so that a larger stretch is reached with the aid of one pair of swing dies only. At the same time, the centers of rotation of the guide rods at the swinging die can be approached one to the other as far as the dimensions of the bearings enable.

Based on this conception, it is especially advantageous to arrange at the outside the guide rods being in connection with the entry end of the swing dies and to have the additional guide rods applied at the delivery end of the swing dies.

In the drawing is schematically shown the special design as an example of the unit being the subject matter of the invention.

The drawing shows one of the swing dies with their drives provided in pairs and arranged symetrically to the pass line.

The swing die 1 is provided with the working surface 2. Two swing dies move symmetrically to the pass line 3.

The advance and return motion is transferred to the swing die by means of the additional guide rod 4 which is connected so that it may be turned with the swing die at the delivery end by the bearing 5.. The guide rod is driven by the eccentric disk 6 on the shaft 7. The swing die, when moving from the left to the right in the drawing, rolls off on the rolling stock turning to the right. During the return stroke caused by the additional guide rod, the swing die is lifted off the rolling stock and swings back to the starting position turning to the left.

The lifting off and rolling off motion of the swing die is caused by the guide rods 10 and 11 engaging in the pivot bearings. They are driven by the eccentric disks 14 and 15 rotating on the shafts 12 and. 13. All eccentric disks are rotating with the same speed.

The shafts 12 and 13 are arranged one after the other perpendicularly to the pass line 3. The guide rod engaging the swing die at the entry side is driven by the shaft 12 arranged at a greater distance from the roll pass.

In the foregoing specification I have described a preferred embodiment of my invention. It will be understood, however, that this invention may be otherwise embodied within the scope of the following claims.

I claim:

1. In an apparatus for swing-forging having at least two pairs of opposing swing dies for longitudinally advancing stock along a pass line, first drive means for alternately displacing said pair of opposing swing dies into engagement with said stock and imparting to said dies a rocking motion for squeezng said stock in a direction transverse to its longitudinal dimension and a second means for advancing and retracting said dies in the direction of the pass line, the improvement comprising in each of said opposing swing dies in said first means a pair of driven shafts in a common plane generally transverse to said pass line, said first means having eccentrics on each said shaft, guide rods one mounted at one end on each of said eccentrics and pivoted at the other end to spaced pivots on the swing die and in said second means a driven shaft spaced from the die in the direction of delivery above the pass line, an eccentric on said shaft, a guide rod mounted at one said eccentric and pivoted at the other end on the 3 '4 delivery end of said die, said first and second means act- FOREIGN PATENTS ing simultaneously to rotate at the same speed. 1 1 96 Sweden 2. An apparatus as claimed in claim 1 wherein the pair fiflzhafts are in a common plane perpendicular to the pass CHARLES W. LANHAM, Primary Examiner References Cited G. P. CROSBY, Assistant Examiner UNITED STATES PATENTS U 8 Cl X R 1,549,527 8/1925 Fielding 72 1s9 72 450 3,114,276 12/1963 Uebing 72-406 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,485,081 December 23, 1969 Friedrich Kocks It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column 2, line 53, after "first" cancel "drive"; line 67, after "one" insert end on Signed and sealed this 27th day of October 1970.

(SEAL) Attest:

Edward M. Fletcher, Jr.

Attesting Officer Commissioner of Patents WILLIAM E. SCHUYLER, JR. 

